This notification is triggered when an address pool's usage
becomes less than or equal to the value of the
natv2PoolThresholdUsageLow object for that pool, unless the
notification has been disabled by setting the value of the
threshold to -1.  It is reported subject to the rate
limitation specified by natv2PortMapNotificationInterval.
          
Address pool usage is calculated as the percentage of the
total number of ports allocated to the address pool that are
already in use, for the most-mapped protocol at the time
the notification is triggered.  The two returned objects are
members of natv2PoolTable indexed by the NAT instance and
pool indices for which the event is being reported.  They
give the number of port map entries using external addresses
configured on the pool for the most-mapped protocol and
identify that protocol at the time the notification was
triggered.

This notification is triggered when an address pool's usage
becomes greater than or equal to the value of the
natv2PoolThresholdUsageHigh object for that pool, unless
the notification has been disabled by setting the value of
the threshold to -1.  It is reported subject to the rate
limitation specified by natv2PortMapNotificationInterval.
          
Address pool usage is calculated as the percentage of the
total number of ports allocated to the address pool that are
already in use, for the most-mapped protocol at the time the
notification is triggered.  The two returned objects are
members of natv2PoolTable indexed by the NAT instance and
pool indices for which the event is being reported.  They
give the number of port map entries using external addresses
configured on the pool for the most-mapped protocol and
identify that protocol at the time the notification was
triggered.

This notification is triggered when the value of
natv2InstanceAddressMapEntries equals or exceeds the value
of the natv2InstanceThresholdAddressMapEntriesHigh object
          
for the NAT instance, unless disabled by setting that
threshold to -1.  Reporting is subject to the rate limitation
given by natv2InstanceNotificationInterval.
          
natv2InstanceAddressMapEntries and
natv2InstanceAddressMapCreations are members of table
natv2InstanceTable indexed by the identifier of the NAT
instance for which the event is being reported.  The values
reported are those observed at the moment the notification
was triggered.

This notification is triggered when the value of
natv2InstancePortMapEntries becomes greater than or equal
to the value of natv2InstanceThresholdPortMapEntriesHigh,
unless disabled by setting that threshold to -1.  Reporting
is subject to the rate limitation given by
natv2InstanceNotificationInterval.
          
natv2InstancePortMapEntries and
natv2InstancePortMapCreations are members of table
natv2InstanceTable indexed by the identifier of the NAT
instance for which the event is being reported.  The values
reported are those observed at the moment the notification
was triggered.

This notification is triggered when the value of
natv2SubscriberPortMapEntries for an individual subscriber
becomes greater than or equal to the value of the
natv2SubscriberThresholdPortMapEntriesHigh object for that
subscriber, unless disabled by setting that threshold to -1.
Reporting is subject to the rate limitation given by
natv2SubscriberNotificationInterval.
          
natv2SubscriberPortMapEntries and
natv2SubscriberPortMapCreations are members of table
natv2SubscriberTable indexed by the subscriber for
which the event is being reported.  The values
reported are those observed at the moment the notification
was triggered.